Add more repository source file links throughout generated doc, especially for types

[mattflix]

When used with Git, TypeDoc inserts links to the source file location for documented items such as class data members, and interface methods.

This is fabulous feature (linking generated documenation to source) -- except it is incomplete. The containing types (not just its members) should also have source links. Currently, only the members get links.

Indeed, when a type happens to have no members (or no members visible in the page due to the doc filter settings), it becomes inconvenient to reach, or even determine, the repository file that contains the type's definition.

IMO, it should always be super easy to link to the source location for the definition of any type.